FGC9 Upper Receiver Long Rail Upgrade
thingiverse
This one is designed specifically to work with the UNW top rail shrouds. The FGC9 Upper Receiver RAIL NLS LR XL plus buffer is an option for those who want a rail on the small piece of buffer tube mounding plate as well. The main difference between this and other options is that it is slightly longer. There are two alternatives to choose from. The G36c edition will stop at the barrel retainer, allowing you to use existing shrouds with a top rail like the UNW top rail series. Alternatively, if you want to upgrade your upper receiver and you have a non-top rail UNW shroud, there is an option called the UNW shroud. This one comes with all the parts needed for that. More information can be found here: https://www.thingiverse.com/untangle/collections/fgc-9-parts-mods
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